The bullet hell is pretty easy;  I managed to beat it with about 25 hours on my save

I found the bullet hell to be impossible.  I managed to get through the first 3 patterns without taking any hits, but then lost all 9 hitpoints in the fourth pattern.

how the hell did you get through the soulstone grind in under 24 hours?

 Finally I also able to beat cat. I first though its imposible but here we are.